Circuit closer for burglar alarms



Jam 28, 1941. R. Q. TRAWEEK, JR 2,230,170

CIRCUIT CLOSER FOR BURGLAR ALARMS Filed Aug. 9, 1938 Raye/ #aww/ZJ:

INVENTOR ATTO R N EYS Patented Jan. 28, 1941 l UNITED STATES PATENTFFECE CIRCUIT CLOSER. FOR- BURGLAR ALARMS Roger Q. Traweek, Jr.,Houston, Tex.

Application August 9, 1938, Serial No. 223,367

1 Claim. (Cl. Z110- 52) This invention relates to burglar alarms, andsuitable for the purpose, and it will lbe noted its general object is toprovide an alarm for use as best shown in Figure l that one corner ofthe With windows, doors and other closures including frame is providedwith an opening therethrough transparent panes, such as glass or thelike, as .for the passage of conductors 3 and 4.

5 my invention consists essentially of a pane of The conductors 3 and iare embedded Within k5 glass having spaced conductor Wires embedded thepane i and extend about the marginal edge therein and insulated fromeach other by the thereof, as well as insulated from each other by glassbut in circuit with alarm means and a suitthe glass, in that theconductors are spaced from able source ci current, so that in the eventthe each other, as will be apparent. The conductors glass is broken theWires contact and close the terminate at one of their ends within thepane 10 circuit to the alarm means. and are arranged in a manner toprovide parallel A further object is to provide a burglar alarm portionsfor each conductor, and the parallel porincluding switch means that isrendered active tions of the conductor 3 and which are indicated toclose the circuit, immediately upon contact by the reference numerals 5and 5 have bridging of the glass embedded conductors, and the cirthesaine and connected thereto conductors 1 15 cuit remains closed eventhough the conductors arranged in zigzag row formation, While the becomeseparated. parallel portions 8 and 9 oi the conductor 4 also Anotherobject is to provide a burglar alarm have bridging the same andconnected thereto of the character set forth that includes conductorconductors I arranged in zigzag row formation,

wires embedded in the glass in a manner, so that but of course arespaced and insulated from the 20 regardless or where the glass isbroken, the Wires conductor 1, due to the arrangement of the remustnecessarily Contact to close the circuit for spective portions of theconductors 3 and 4 with the purpose referred to. respect to each other,and as will 'be apparent A still further object is to provide a burglarupon inspection of Figure 2. It will be further alarm that is simple inconstruction, inexpensive noted as best shown in Figure 3 that the con-25 to manufacture, easy to install, and extremely ductors l and le aredisposed at right angles efficient in operation, use and serviceto eachother, and it is believed that it will be This invention also consistsin certain other obvious that in the event the pane is broken atfeatures of construction and in the combination any place in its area,'the conductors 'I and I0 and arrangement of the several parts, to beherewiil contact with each other, for a purpose which 30 inater fullydescribed, illustrated in the accomwill be later described. panyingdrawing and speciiically pointed out in While the portions of theconductors 3 and 4 the appended claim. that are arranged within the paneare bare or in In describing the invention in detail, reference otherwords are not covered by insulating cover- Will be had to theaccompanying drawing Whereing material, the portions of the conductors 335 in like characters denote like or corresponding and S that extendthrough the opening in the parts throughout the several views, and inwhich: frame 2, as well as other exterior port-ions thereof,

Figure l is a front view of my burglar alarm are covered by suitableinsulating material. The glass. conductor 3 extends to a main switch Ilthat Fgure is a sectional View taken aDPIOXma'elikewise has a conductorl2 connected thereto 40 1y 0n 1121 2 2 0f Figure l: looking in thedirec" that in turn is connected to a suitable source of tion 0f theWOWS; current, while the conductor 4 is connected to Figure 3 15 adlagrammamc new of the circuit suitable alarm means, such as a bell I3,as shown foff'he altm' d t .1 1 ,u t t h 1. in Figure 3, and the bell isgrounded by a con- Flgre lsta fetll Vlewdlu lis lilgt eculr ductor lliwhich has one end connected to the 45 arranzemen o e con C O1 Vs W m ebell conductor i5. While the alarm means is glass' shown as being a ben,it wm be obvious that it Referring to the drawing in detail, thereference numeral I indicates apane of glass or other can be Visualmeans, or other suitable audible suitable transparent means, and whilethe pane meansi 50 is shown as being square, it will of course be un- F10m the above descflptlon and disclosure 1n derstood that it can be madein any shape withthe drawing, it will be obvious that when the outdeparting from the spirit of the invention. main Switch ii iS Closed,and any portion of the The pane is mounted in a channel frame 2 thatclass embedded conductors should become disis preferably made fromrubber or other material posed in contact, upon breaking of the glass aswill lbe apparent, the circuit will be closed to the alarm means or bellI3.

Y While the circuit will be closed to the alarm means, in the event thatthe embedded conductors Should become disposed in contacting engagement,the circuit will be open, should the conductors become separated, and inorder to eliminate that disadvantageous feature, I employ switch meansin the above circuit which includes a base I5 having mounted thereon arelay including a magnet I7 and an armature arm I8, the relay being incircuit with the conductor 4 by a conductor I3 and with the valarm meansby the conductor i5. The relay is primarily designed for operating aswitch that includes an upright 2i] mounted on and rising from the baseI6, with spring contact fingers 2| arranged in pairs thereon, forreceiving contact members 22 carried by an arm 23 pivotally secured tothe base I6. The armature arm I8 is likewise pivotally secured to thebase and pivotally mounted between the ends of the armature arm I8 isone end of a lever 24 that has its opposite end engaging the switch arm23, for moving the contact members 22 between the fingers 2|, for thelatter to set up a gripping engagement therewith to hold the switchclosed, and the circuit accordingly, when the relay is energized, aswill be apparent. One pair of the contact ngers 2| is connected to theconductor 3, by a conductor 25, while the other pair is connected to theconductor 4 by a conductor 26.

It is believed that the operation of the switch means will be apparentbut it might be mentioned that by use of the switch means, that in theevent the glass embedded conductors should become separated, the alarmmeans will be continuously operated, and such as brought about by therelay being energized, for moving the switch arm 23 to closed position,through the instrumentality of the lever 24. In order to open thecircuit, the

switch arm 23 must be manually moved to open` position. I have alsoillustrated guiding and supporting means 2 for the lever 24 and Whichpreferably includes a roller 28 having the lever 24 mounted thereon, asclearly shown in Figure 3.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction andin the combination and arrangement of the several parts, provided thatsuch changes fall within the scope of the appended claim.

What I claim is:

In an electric burglar alarm, a pane of glass for Windows, doors and thelike, a pair of spaced conductors embedded within the pane to follow themarginal edge thereof in close proximity thereto and arranged to provideparallel portions, said conductors extending from said pane through onecorner thereof and having one of their ends terminating within saidpane, conductors connected to and bridging the parallel portions of eachof the nrst conductors and arranged in row formation, the rows being inspaced planes and disposed at right angles to each other, the conductorsof each row being disposed in zigzag formation and in equi-distantlyspaced relation to each other, certain of the zigzag portions t of theconductors of one roW being disposed parallel with and in closeproximity to certain of the zigzag portions of the conductors of theother row, a channel frame of insulating material with the pane mountedin thechannel thereof, and said frame having an opening in one of itscorners for the passage of the .Erst conduct-ors therethrough forconnection in circuit with an alarm.

ROGER Q. T'RAWEEK, JR.

